Maximum-traction truck.



s. ADAMS. MAXIMUM TRACTION TRUUK. APPLIOATIOM FILED JUNE 20, 190B.

91 9 ,803, r Patented Apr. 27, 1909.

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wmmssas: f INVENTOR zt' Mia-1J6 M BY ATTORNEY.

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' M w. s. ADAMS. MAXIMUM TRACTION TRUCK. APPLICATION FILED JUNE 20, 1908.

Patented Apr. 27, 1909.

3 SHEETS-SHEET 2.

M/"Jfldawu THE MORRIS PETERS CO-, IllsHINOTON, D C.

INVENTOR 25 Y ATTORNEY W. S. ADAMS. MAXIMUM TRACTION TRUCK. APPLIOAUTIOR IILBD JUNE 20, 190B.

Patented Apr. 27, 1909.

3 SHEEIS-SHEBT 3.

,A vM S v I VINVENIOR 2 A v JZJZQ/IM l BY P m; ATTORNEY.

Til NORRIS PEI-tum WIISUINGTQN. D-G

PATENT OFFICE.

WALTER s. AnAMs, OR PHILA ELPHIA, PENNSYLVANIA, AssIeNoR TO THE J. G. BRILL 00., OF PHILAn rrn A, PENNSYLVANIA, A. cORPoRATIoN OF-PENNSYLVANIA.

' 'MAxmmvrs'rRAo'rroN TRUCK.

' Specification of Letters ?atent.

- Patented April 27, 1909.

Application filedlune20, 190s. sria1No.4a9,5ss.

T 0 all whom it may conc era A Be it known that I, WALTER S. ADAMS, a citizen of the United States, and a resident of the city and county of Philadelphia, State of Pennsylvania, have'invented'a new and useful Improvement in Maximum Traction Trucks, of which-the followingis a specifie cations In. an appTlication filed by me une 19th,

.wheels leading; and to thatendthespecific improvements embodied herein consists in providing a car truck of the type disclosed in my said 00- ending application, with a'weight shifting an self-centering end-bearing, the result of the use of whichbeingthat on a straight track the end bearing will tend to preserve the truck and car inparallelism, and at the same time, tend to keep the small or leading wheels down on'the track with the pressure thereon that they have been. designed to bear, and when the truck leaves a straight track and takes a curve the smaller wheels will-bepressed down by a spring action graduating the. pressure to the particular requirements and always placing it upon the Outside wheels.

For a more particulardescriptionofmy mwich: 1 H Figure 1 isa side elevation of a truckembodying my improvements together with a portion of the carnecessary to cooperate therewith. Fig.2 isa plan view of. this structure. Fig. 3 is an end elevation of the structure shown in the other figures.

Throughout the various views of the drawings, similar reference characters designate similar parts. I My improvements' maybe applied to any form of truck ofthis .typeespeciallyadapted and organized to receive-them, but .(I prefer em loying them in connection with the specia form of truck shown" herein and which forms the subject matter of myapplication hereinabove referredto, 7

large driving wheels 2 connected withanaxle 3 and the similar wheels 4 are connected by an axle 5. The axle 3 is journaled in suitable axle boxes which carry the usual axle box springs 7 which in turn su port the side frame 8 of the truck 1. Eac side frame 8 is provided. with a suitable pedestal 9 in which the axle box 6 has vertical movement andprojecting from one pedestal leg 9 and at the ,lower end thereof is an arm 10 bent inwardly at substantially 45 degrees near its free end and there joined to an angle crossing 11 of the conventional type, which crossing 11" supports one end of the motor, not shown,

andunites the side frame 8. A

. The leg' of the pedestals 9 opposite the legs to which the arms 10 are attached is provided' at its upper ends with top chords 12 whichextend to the pedestals 13 in which the axle boxes 1 1 slide, and the axle boxes 14 are provided with the usual axle box springs 15 by which the pedestals 13 are su ported. The axle boxes 14 have the axle -5journaled therein. As the Wheels 4 have a smaller diameter than the driving wheels 2, the top chord has to be bent downwardly in a vertical plane, as shown in Fig. 1, to compensate for this difference in diameter. The pedestals 9 and 13 are also united by suitable tie-bars 16 which are secured to suitable lugs 17 and 18 projecting from the pedestals 9 and 13 res ectively. The lower ends of the legs of t epedestals are also united by the usual connections 19 and 20 V V respectively. The vpedestals 13 are also invention reference is to. be had to the accom anying drawings forming a part hereof,

unltedby a crossing 21 secured to webs22 integral with or fixed to the pedestal '13. The top chords 12 are also united by means of transoms 23 secured in any suitable manthe other transom 23 is slightly bent at 25 as shown in dotted lines in Fig. .2 so as to permit a larger bolster 26 to be employed and thebolster to be brought nearer the driving wheels 2. A r

The bolster 26 is supported in the following manner. Stirrups 27 which are hung from the chords 12, two from each chord, and these stirrups 27 which are hung from the j same chord are'connected by an equalizing My improved truck 1' isprOvided; with bar28 and the bars 28 are united by a sand elliptical springs 30 are mounted. These springs 30 support the bolster 26 in the conventional manner.

The bolster 26 may be made in any suit able form and is preferably provided with side bars 31 united by the end blocks 32 and the center block 33 through which the king bolt passes. The end blocks 32 also support suitable side rub plates 34 of the conventional form and mounted in the conventional manner.

The transom 23 adjacent to the trailing wheels 4 is connected with the crossing 21 by suitable angle metal bars 35 secured in any suitable manner and from which are suspended suitable brackets 36 which are joined by rods 37 on which are sliding collars 38 which carry the plow 39 through Which electricity is carried to the car. It is obvious that where an over head trolley is to be used instead of a plow, this plow 39 and its supporting means may be omitted.

To rovide means for shifting the proportione Wei ht of the car on the outside wheel of the smaIl pair 4 when the truck is curving, and at the same time provide efficient means for keeping those Wheels down on the track by the application of a pre determined amount of pressure thereon, I employ the following construction.

The crossing 21 is provided with a plate 40 having a centrally beveled angular depression 40 the extensions of the plate beyond the depression and at both sides being preferablyhorizontal as at 40*. At 41. is shown a spring-pressed plunger having a squared head 41 passing through a squared aperture in the bracket 42. The operative end of the plunger head is angularly formed to coincide with the depression 40 in the plate 40. The plunger 41 is supported by the bracket 42 suitably secured to short sills 43 which are in turn secured to the car body 44. At 45 is a cap secured to the lower side of the car body in any suitable manner, against which bears a coil-spring 46 resting on its lower end in the spring cup 47 Which may be either integral with the plunger or fixed to it in any suitable manner, the spring 46 encircling the upper end of the same. Y

When on a tangent or curve, the spring presses the inclined head of the plunger into the inclined surface of the depression in the plate 40 with a predetermined amount of pressure, the cooperation of the spring in the two inclined'surfaces tending to keep the union of the car and the truck more stable while on the tangent; and when a curve is reached the plunger head will be forced out of the depression against the stress of the spring and will move out toward the outer rail, bringing additional ressure upon theouter of the smaller wheels. y this construction I am enabled to use the smaller wheels as pilot wheels, instead of using them, as has been the prevailing practirc, as trailing wheels. By using them as leading or pilot wheels I am enabled to locate them closer to the platforms and do away with the high placing of the car body,

thereby reducing the height of the steps and avoid cutting away the sills, or of side running boards in open cars, the reduction of the height of the truck frame and the wheels at the leading ends being such as to enable the truck to swin clear underneath the car at those points wit rout interference.

While I have shown and described. one embodiment of my invention, it is obvious that it is not restricted thereto but covers all structures that come within the scope of the annexed claims.

Iaving described my invention, what I claim is:

1. In a car truck, the combination with the truck frame, large driving wheels and smaller wheels, means for providing a pivotal connection between the truck and the car body supported by the truck eceentrically with relation to the driving wheels, a crossing extending between the side pieces of the truck frame adjacent the smaller wheels, a plate having a central depression secured to the said crossing, the depression being in line with the longitudinal center of the truck, a spring-pressed )lunger provided with a head having an angiilar operating face adapted to engage the angular depression in said plate and disposed over the said plate and. means for connecting said plunger with a car body.

2. In a car truck having a frame and large driving wheels and smaller wheels, a pivotal center located adjacent the driving wheels, a crossing extending between the side pieces of said truck frame located beyond the said smaller wheels, a cam plate fixed to said crossing having a depression in line with the longitudinal center of the truck, a springpressed plunger disposed over the :am plate having an operative face adapted to engage said depression, and means for connecting said plunger with a car body.

In a car truck, the combination with the truck frame, large driving wheels and smaller wheels, a cross bolster supported by the truck frame eccentrically with relation to the driving wheels, means for pivotally connecting a car body with said bolster, a crossing extending between the side members of said frame outside of the small wheels, a plate supported on said crossinghaving a central depression in line with the longitudinal center of the truck, a spring-pressed plunger provided with a head having an annular operating face adapted to engage the annular depression in said plate, andv disposed over said plate, and means for connecting said plunger with a car body.

4. In a car truck having a frame and large driving Wheels and smaller wheels, a cross bolster supported by said frameeccentrically with relation to the driving wheels and carrying means for pivotally-connecting it With a car body, a crossing extending between the side pieces of said truck frame located beyond said smaller wheels, a cam plate fixed to said crossing having a de ression in line with the longitudinal center of the truck, a springpressed plunger disposed over the cam plate and having an operative face adapted to engage said de ression, andmeans for conneoting said p unger with a car body.

5. In a device of the class described, means for connecting a truck and car body comprising in combination a car provided with suitable sills a bracket 42 secured tosaid a cam plate40 provided with a centrally located angular depression 40 for engagement with the angular face of the plunger 41 Signed at the city and county of Philadelphia, State of Pennsylvania, this 18th day.

of J une, 1 908.

, WALTER S. ADAMS.

Witnesses: 1

- WM. M. LLOYD, Jr.,

TERREN'GE MoOUsKnR. 

